Abstract:
The gas phase hydrogenation of adiponitrile (ADN) to 1,6- hexamethylenediamine (HMDA) over nickel supported on ceria-zirconia and ceria-zirconia-magnesia mixed oxide catalysts was studied at atmospheric pressure. The catalysts, Ni/Ce0.75Zr0.25O2 and Ni/Ce0.75Zr0.15Mg0.20O2, were prepared via coprecipitation, followed by 15 %wt. Ni impregnation. The catalysts were characterized by several techniques, i.e., N2 -physisorption, H2 -TPR, XRD, and NH3- TPD. The reaction was carried out using a continuous flow fixed-bed reactor by varying temperature, hydrogen-to-adiponitrile mol ratio (H2/ADN), gas hourly space velocity (GHSV), and acidity of the supports. The main product produced via partial hydrogenation was observed to be 6 -aminohexanenitrile. The catalyst with less support acidity can enhance the production of HMDA.
